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Iowa Water Hardness

Across the 5 cities we track in Iowa, hardness ranges from 6.29–26.3 GPG, with 3 cities running hard or very hard, and 1 more city doesn't publish a figure.

5 cities tracked. View the Iowa hardness map → · Is Iowa water safe to drink? →

Sioux City

26.3 GPG · 450 ppm
Very Hard

Waterloo

19.4 GPG · 332 ppm
Very Hard

Des Moines

7 GPG · 120 ppm
Hard

Cedar Rapids

6.75 GPG · 115 ppm
Moderate

Iowa City

6.29 GPG · 107.5 ppm
Moderate

Cities with no published figure

These Iowa cities don't publish a hardness number (it isn't a regulated parameter), so they can't be ranked — but we still track them. See each page for how to check your own tap.

Davenport

Hardness not published
Not Published